{"id":"F2009L03419","name":"AD/TPE 331/17 - Turbine Bearing Oil Inlet Tube - Replacement - CANCELLED","slug":"ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140997,"registerId":"commonwealth-F2009L03419-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AlliedSignal (Garrett/AiResearch) Turbin","sectionType":"division","heading":"AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series","content":"### AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series\n\n| AD/TPE 331/17 | Turbine Bearing Oil Inlet Tube - Replacement | 10/2009 |\n| ------------- | -------------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                             |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 24 September 2009.                                                                                                                                                             |\n| Background:  | This unique Australian AD specified action in accordance with Airesearch SBNo. 79-0007 before installation in an aircraft following reconditioning after September 1974. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2009","sortOrder":0},{"sectionNumber":"AD/TPE 331/17","sectionType":"part","heading":"AD/TPE 331/17","content":"## AD/TPE 331/17","sortOrder":1},{"sectionNumber":"Turbine Bearing Oil Inlet Tube - Replace","sectionType":"part","heading":"Turbine Bearing Oil Inlet Tube - Replacement","content":"## Turbine Bearing Oil Inlet Tube - Replacement","sortOrder":2},{"sectionNumber":"10/2009","sectionType":"part","heading":"10/2009","content":"## 10/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1977},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument performs exactly as its title suggests—terminating a specific previous airworthiness directive. It does not expand regulatory reach into new operational areas or impose new obligations; it purely eliminates an existing requirement."},"complexity_factors":["Single operative provision ('CANCELLED') with no conditions or exceptions","No defined terms or interpretation section","No cross-references to other legislation beyond the named predecessor instrument","Total binding text under 30 words"],"plain_english_summary":"This legislation scraps an old aviation safety rule about specific aircraft engines.\n\n**What it does**\n- Permanently cancels a previous requirement to replace or inspect **turbine bearing oil inlet tubes** on **AlliedSignal (Garrett/AiResearch) TPE 331 series turbine engines** (commonly used in small turboprop aircraft)\n- Removes the need for mechanics to follow a specific manufacturer service bulletin (Airesearch SBNo. 79-0007) before installing these engines after they have been reconditioned (overhauled)\n\n**Who it affects**\n- Aircraft operators and maintenance organisations using planes powered by TPE 331 engines\n- Anyone involved in engine overhauls for these specific models\n\n**Why it matters**\n- The original rule applied to engines reconditioned after September 1974; as of 24 September 2009, that restriction no longer exists\n- Reduces paperwork and compliance costs for engine maintenance without replacing it with new requirements"}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement-cancelled","history":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement-cancelled/history","analysis":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement-cancelled/analysis","conflicts":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement-cancelled/conflicts","importantCases":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement-cancelled/important-cases","documents":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement-cancelled/documents"}}